Use the interactive map below to check population changes. Zoom in to see where Podocnemis unilfilis is Endangered based on IUCN Redlist criteria - A3bd.
This is an extension of Norris et al 2019 that includes:
- stochastic population projections
- threats caused by human acessibility (hunting and habitat change) and actions that reduce river connectivity.
Due to the number of points, the map can become slow to respond when you zoom in. Zoom out to a level showing fewer points and you can pan around the map to find the area of interest. Then zoom in again to check the coloured points.
When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.
A summary of the results is presented below. Summaries by country and major basin. Summary by country.
| Country | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|
| Bolivia | 0.91 | 18739 | 17098 | 1641 |
| Brazil | 0.75 | 123498 | 92740 | 30758 |
| Colombia | 0.62 | 18037 | 11266 | 6771 |
| Ecuador | 0.95 | 3330 | 3176 | 154 |
| French Guiana | 0.76 | 1833 | 1390 | 443 |
| Guyana | 0.70 | 4675 | 3272 | 1403 |
| Peru | 0.91 | 23447 | 21304 | 2143 |
| Suriname | 0.54 | 3908 | 2103 | 1805 |
| Venezuela | 0.69 | 18382 | 12623 | 5759 |
Summary by basin.
| Basin | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|
| Amazon | 0.77 | 170905 | 131958 | 38947 |
| Coastal North | 0.68 | 12700 | 8626 | 4074 |
| Coastal South | 1.00 | 5711 | 5711 | 0 |
| Orinoco | 0.70 | 26533 | 18677 | 7856 |
Summary by major basins and countries.
#> `summarise()` has grouped output by 'BASIN_N'. You can override using the
#> `.groups` argument.| Basin | Country | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|---|
| Amazon | Bolivia | 0.91 | 18739 | 17098 | 1641 |
| Amazon | Brazil | 0.74 | 116106 | 85750 | 30356 |
| Amazon | Colombia | 0.54 | 7769 | 4229 | 3540 |
| Amazon | Ecuador | 0.95 | 3330 | 3176 | 154 |
| Amazon | Guyana | 1.00 | 299 | 299 | 0 |
| Amazon | Peru | 0.91 | 23447 | 21304 | 2143 |
| Amazon | Venezuela | 0.08 | 1215 | 102 | 1113 |
| Coastal North | Brazil | 0.76 | 1681 | 1279 | 402 |
| Coastal North | French Guiana | 0.76 | 1833 | 1390 | 443 |
| Coastal North | Guyana | 0.68 | 4376 | 2973 | 1403 |
| Coastal North | Suriname | 0.54 | 3908 | 2103 | 1805 |
| Coastal North | Venezuela | 0.98 | 902 | 881 | 21 |
| Coastal South | Brazil | 1.00 | 5711 | 5711 | 0 |
| Orinoco | Colombia | 0.69 | 10268 | 7037 | 3231 |
| Orinoco | Venezuela | 0.72 | 16265 | 11640 | 4625 |
Next steps
- Update using points from Free Flowing Rivers
https://www.worldwildlife.org/pages/free-flowing-rivers